I bought an Italian product, I must say also attra...

I bought an Italian product, I must say also attracted by the price, and specifically an Ariston BSII 24 FF boiler which, after a couple of years, burned the control board (I don't know why as the fuse placed upstream of the circuit should serve to preserve the card from possible voltage surges but ... let's admit that this can happen and the card "burns").

I paid for the boiler 420 + the smoke kit.

Today the technician asks me 320 to replace just the burnt card.

Considering the broken piece, the request for this sum to replace the card alone seems to me really exaggerated.
I think that, given the high cost of the Italian assistance of these products, at the moment I will find a remedy but .... NEVER AGAIN ARISTON. thank you